Evan Frost Profile picture
Sep 16, 2021 12 tweets 5 min read Read on X
There’s something inaccurate and potentially misleading about a lot of media coverage on western forests & wildfires. Many articles mention the end of Indigenous mgmt, fire suppression & climate change as factors responsible for recent uptick in fires - all true, but...🧵1/11 The 2021 Dixie Fire burning...
What they often fail to mention is the role commercial logging plays in creating today's more fire-vulnerable forests. This is important because if we don’t understand the main factors contributing to undesirable fire effects, we’re unlikely to choose the best path forward. 2/11 Old-growth ponderosa pine l...
It is well-documented that logging has resulted in the widespread and dramatic loss of large/old conifers in most western dry forests -- these trees by far are the most resistant to fire and historically comprised the "living foundation" of fire-resilient forests. 3/11 An old-growth mixed conifer...
Forests previously dominated by large/old, fire-resilient conifers have mostly been replaced by younger, denser, more homogeneous stands of less fire-tolerant trees that exhibit more continuous fuels, higher rates of fire spread & are vulnerable to more severe fire effects. 4/11 Google Earth view of tree p...Tree plantation showing uni...
Compared to forests dominated by large/old trees, stands planted after logging (plantations) are much more vulnerable to fire because they tend to be windier/drier/hotter (esp. under extreme weather) and exhibit higher surface and ladder fuel loads. capradio.org/articles/2015/… 5/11
A number of studies have found that logging has contributed significantly more to increased tree density & higher fuel loads than changes caused by fire exclusion alone (Minnich et al.1995, Kauffman et al.2000, Odion et al.2004, Naficy et al.2010). opb.org/news/article/w… 6/11
Yet in most media stories & public policy dialogs, the effects of fire suppression & timber mgmt. practices are conflated, leading to the common *misperception* that increased fuel loads and tree density are solely the result of fire suppression. capradio.org/articles/2020/… 7/11
Most logging on both public & private land continues to focus on overstory tree removal, running contrary to what we know about how to create fire-resilient forests.Timber sales on BLM & USFS lands (here in s OR & CA) still removing large numbers of old/fire-resistant trees. 8/11 Old-growth, fire-resistant ...
“Eventually you’re not going to have any big trees on the whole forest,” said Dave Mertz, who worked as a government natural resources officer overseeing Black Hills [NF] logging until retiring in 2017. “The timber industry is pulling the strings now.”apnews.com/article/fires-… 9/11
The reality is if we're serious about restoring dry forest ecosystems, we need to align timber mgmt practices w/what we know about the ecology of fire & forest dynamics. Even-aged logging & removal of large/old trees are incompatible w/creating more fire-resilient forests. 10/11 Even-aged tree plantation w...
The takeaway -- we need to pivot forest mgmt toward what to retain/restore based on ecological concerns, rather than what to remove to generate economic returns; e.g. ⬆️⬆️⬆️ wildland fire use, prescribed fire & pyrosilviculture. uniondemocrat.com/news/article_f… 11/11
"...logging leaves a landscape that is dramatically hotter, drier, and windier — precisely the type of conditions that increase the risk of wildfire ignition and spread." bozemandailychronicle.com/opinions/guest…

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More from @EFrost_Wildwood

Feb 21, 2023
It doesn't take a scientist or forester to see that NAmerica's forests are changing rapidly, sometimes in ways never seen before. For #thicktrunktuesday let's review some new terms being used to describe these changes, & take a tour thru America's Forests of the Anthropocene. 🧵 Giant Sequoias in Sequoia N...
'Ghost forests' are those killed by sea level rise or increased flooding tied to climate change. Bc of rising water tables, once coastal forests die they're unlikely to be replaced. Ghost forests have been ⬆️ rapidly along parts of the eastern seaboard. 2/ washingtonpost.com/climate-enviro…
'Zombie forests' are comprised of trees that established near of the edge of their envrmtl tolerance & are surviving now, but their long-term persistence is likely doomed bc the increasingly warmer/drier climate no longer supports them. 3/ washingtonpost.com/graphics/2020/…
Read 14 tweets
Jan 31, 2023
On this chilly #thicktrunktuesday, let's take a mid-winter trip to the warm Southwest desert and, to begin, play a quick guessing game. Which of these two trees do you think is older -- the 200' tall coast redwood or the squat, sprawly guy on the right? 🧵1/8
Yes, that desert ironwood (Olneya tesota) has likely been around longer than many much larger, faster-growing redwoods. Ironwoods may not be the most impressive old-growth tree in terms of size, but often very old & important to the Sonoran desert ecosystems where they grow. 2/8
A member of the legume family, ironwoods grow on valley floors & dry washes <2,500 ft in SoCal, AZ & nw Mexico. The name comes from their remarkably dense 'iron-like' wood. One of the heaviest in the world, ironwood is so heavy that if you drop a chunk into water, it sinks! 3/8 Large washes on low valley floors are the typical habitat of
Read 8 tweets
Aug 23, 2022
This summer I've been observing exceptional levels of recent, widespread tree mortality in the eastern Sierra Nevada. These die-offs are happening across multiple landscapes and species -- likely a result of severe drought conditions exacerbated by climate change.🧵
At lower treeline in both the southern Sierra & White/Inyo Mtns, large areas of pinyon pine (Pinus monophylla) have recently died. Although this species is extremely drought resistant, even they have limits to what is survivable. Both older & young trees have succumbed. Broad scale recent die-off of pinyon pine forest, eastern SiBroad scale die-off of pinyon pines, eastern Sierra NevadaRecently dead pinyon pines, southern White Mountains, CAYoung recently dead pinyon pine sapling in the eastern Sierr
At upper elevations in the central & southern Sierra, conspicuous pockets of tree mortality include red fir, lodgepole, limber, whitebark & even foxtail pines - renowned for their ability to live for centuries on bare, rocky slopes - have been unable to cope w/ these conditions. Recent die-off of whitebark pines, central Sierra Nevada, CARecently dead whitebark pine, Sierra Nevada, CALarge, recently dead red fir, southern Sierra Nevada, CARecently dead foxtail pine, southern Sierra, CA
Read 8 tweets
Jul 13, 2022
...is the role that past logging has played in creating today's forests that are much more prone to large, intense wildfires. This is true not just on pvt and public 'multiple-use' national forests, but also in some cases, national park including Yosemite. 2/n Image
Most ppl walking thru YNP forests think they're in a protected wonderland, but much of the park's low & mid-elevation forests - what were some of the most impressive pine-dominated forests on earth - were extensively logged between 1911-1942 by the Yosemite Lumber Company. 3/n Historic photos of commerci...ImageImageImage
When YNP was first created, no money was set aside to buy out existing logging, mineral & grazing rights, so the park had to accommodate these claims. Some claims were eventually bought out or protected thru land swaps, but most were simply exercised. exhibits.stanford.edu/ruderman/catal… 4/n Map of initial ~10,000 acre...Photo of historic logging i...
Read 20 tweets
Oct 12, 2021
Last week I toured portions of CA’s Dixie fire (Lassen & Shasta Counties), as well as last year’s Sheep fire & adjacent unburned forestlands. While conditions out there are variable & can see range of fire effects, my overall impressions were disturbing on several levels. 1/12 Map of the Dixie fire, from Wildfire Today
A large majority of the managed stands/tree plantations burned severely w/near-complete mortality. Not surprising, given that managed stands are often uniformly dense, support high ladder fuel loads, facilitate rapid fire spread & smaller trees have little/no fire resistance 2/12 Managed stands and tree plantations on private lands primari
In places where remnant large/old trees existed before the fire, they tended to show much higher survival than smaller trees in the same stands. If these forests had been dominated by large trees - as they were prior to logging - fire resiliency would be dramatically greater 3/12 Surviving large overstory ponderosa pine among young/smaller
Read 13 tweets

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